Influence of the vapour channel on processing in laser powder bed fusion

Document identifier: oai:DiVA.org:ltu-75755
Access full text here:10.1016/j.promfg.2019.08.012
Keyword: Engineering and Technology, Materials Engineering, Manufacturing, Surface and Joining Technology, Teknik och teknologier, Materialteknik, Bearbetnings-, yt- och fogningsteknik, High speed imaging, SLMPowder movement, Pressure, Produktionsutveckling, Manufacturing Systems Engineering
Publication year: 2019
Abstract:

Additive Manufacturing provides many opportunities to design and manufacture parts that are difficult or not possible to produce with conventional methods. In Selective Laser Melting (SLM) in powder bed fusion (PBF), melt pool dynamics and stability is dependent on a large number of factors, e.g. laser power output, power density, travel speed, reflectivity of powder bed, rapid heating and vaporization. Since travel speeds are often very fast and the laser interaction zone is small, the physical events become difficult to predict but also to observe. This work aims to describe the formation and geometrical characteristics of the vaporization zone during processing. Using a combination of theoretical descriptions, resulting material structures and a comprehensive analysis of high-speed images of the processing zone for different heat inputs and travel speeds, explanations for the dynamic melt pool behaviour are derived. The melting and pressures from processing involved moves powder particles next to it, changing the conditions for neighbouring tracks due to lack of material. These findings can provide a basis for creating more efficient and stable SLM processing, with fewer imperfections.

Authors

Jan Frostevarg

Luleå tekniska universitet; Produkt- och produktionsutveckling
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Jöerg Volpp

Luleå tekniska universitet; Produkt- och produktionsutveckling
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Cassidy Thompson

Luleå tekniska universitet; Institutionen för teknikvetenskap och matematik
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Himani Siva Prasad

Luleå tekniska universitet; Produkt- och produktionsutveckling
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Tatiana Fedina

Luleå tekniska universitet; Produkt- och produktionsutveckling
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Frank Brückner

Luleå tekniska universitet; Produkt- och produktionsutveckling; Fraunhofer Institute for Material and Beam Technology, Dresden, Germany
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